[3] Martínez's first senior career club became Gimnasia y Tiro in 2013, who he featured for during the 2012–13 Torneo Argentino A; making his debut against Guaraní Antonio Franco on 20 February.
[3] After two and a half years with the club, during which time he scored seventeen goals in fifty-four appearances, Martínez completed a move to fellow Torneo Federal B outfit Central Norte.
[3] His first appearance in professional football came on 11 March versus Universitario de Sucre, playing the final twenty-three minutes of a 3–1 defeat.
[3] Martínez terminated his contract at the end of April, after experiencing many issues; including withheld wages and lack of action due to new ownership.
[10] He was also stranded in El Salvador during the COVID-19 pandemic, a period in which Chalatenango made him and teammate Marcos González depart their club apartment; having paid them their wages.